grafana/pkg/services/alerting/ticker_test.go

package alerting

// import (
// "testing"
// "time"
//
// "github.com/benbjohnson/clock"
// )
//
// func inspectTick(tick time.Time, last time.Time, offset time.Duration, t *testing.T) {
// if !tick.Equal(last.Add(time.Duration(1) * time.Second)) {
// 	t.Fatalf("expected a tick 1 second more than prev, %s. got: %s", last, tick)
// }
// }
//
// returns the new last tick seen
// func assertAdvanceUntil(ticker *Ticker, last, desiredLast time.Time, offset, wait time.Duration, t *testing.T) time.Time {
// for {
// 	select {
// 	case tick := <-ticker.C:
// 		inspectTick(tick, last, offset, t)
// 		last = tick
// 	case <-time.NewTimer(wait).C:
// 		if last.Before(desiredLast) {
// 			t.Fatalf("waited %s for ticker to advance to %s, but only went up to %s", wait, desiredLast, last)
// 		}
// 		if last.After(desiredLast) {
// 			t.Fatalf("timer advanced too far. should only have gone up to %s, but it went up to %s", desiredLast, last)
// 		}
// 		return last
// 	}
// }
// }
//
// func assertNoAdvance(ticker *Ticker, desiredLast time.Time, wait time.Duration, t *testing.T) {
// for {
// 	select {
// 	case tick := <-ticker.C:
// 		t.Fatalf("timer should have stayed at %s, instead it advanced to %s", desiredLast, tick)
// 	case <-time.NewTimer(wait).C:
// 		return
// 	}
// }
// }
//
// func TestTickerRetro1Hour(t *testing.T) {
// offset := time.Duration(10) * time.Second
// last := time.Unix(0, 0)
// mock := clock.NewMock()
// mock.Add(time.Duration(1) * time.Hour)
// desiredLast := mock.Now().Add(-offset)
// ticker := NewTicker(last, offset, mock)
//
// last = assertAdvanceUntil(ticker, last, desiredLast, offset, time.Duration(10)*time.Millisecond, t)
// assertNoAdvance(ticker, last, time.Duration(500)*time.Millisecond, t)
//
// }
//
// func TestAdvanceWithUpdateOffset(t *testing.T) {
// offset := time.Duration(10) * time.Second
// last := time.Unix(0, 0)
// mock := clock.NewMock()
// mock.Add(time.Duration(1) * time.Hour)
// desiredLast := mock.Now().Add(-offset)
// ticker := NewTicker(last, offset, mock)
//
// last = assertAdvanceUntil(ticker, last, desiredLast, offset, time.Duration(10)*time.Millisecond, t)
// assertNoAdvance(ticker, last, time.Duration(500)*time.Millisecond, t)
//
// // lowering offset should see a few more ticks
// offset = time.Duration(5) * time.Second
// ticker.updateOffset(offset)
// desiredLast = mock.Now().Add(-offset)
// last = assertAdvanceUntil(ticker, last, desiredLast, offset, time.Duration(9)*time.Millisecond, t)
// assertNoAdvance(ticker, last, time.Duration(500)*time.Millisecond, t)
//
// // advancing clock should see even more ticks
// mock.Add(time.Duration(1) * time.Hour)
// desiredLast = mock.Now().Add(-offset)
// last = assertAdvanceUntil(ticker, last, desiredLast, offset, time.Duration(8)*time.Millisecond, t)
// assertNoAdvance(ticker, last, time.Duration(500)*time.Millisecond, t)
//
// }
//
// func getCase(lastSeconds, offsetSeconds int) (time.Time, time.Duration) {
// last := time.Unix(int64(lastSeconds), 0)
// offset := time.Duration(offsetSeconds) * time.Second
// return last, offset
// }
//
// func TestTickerNoAdvance(t *testing.T) {
//
// // it's 00:01:00 now. what are some cases where we don't want the ticker to advance?
// mock := clock.NewMock()
// mock.Add(time.Duration(60) * time.Second)
//
// type Case struct {
// 	last   int
// 	offset int
// }
//
// // note that some cases add up to now, others go into the future
// cases := []Case{
// 	{50, 10},
// 	{50, 30},
// 	{59, 1},
// 	{59, 10},
// 	{59, 30},
// 	{60, 1},
// 	{60, 10},
// 	{60, 30},
// 	{90, 1},
// 	{90, 10},
// 	{90, 30},
// }
// for _, c := range cases {
// 	last, offset := getCase(c.last, c.offset)
// 	ticker := NewTicker(last, offset, mock)
// 	assertNoAdvance(ticker, last, time.Duration(500)*time.Millisecond, t)
// }
// }